PHYLLOPOD CRUSTACEANS. 283 



carapace, the mandibular segment being small and not over- 

 lapping the segments behind it. The second antennas are 



Tig. 242.-Lepidurus Couesii. 

 side and dorsal view, natural 

 size. 



Pig. W -Apus (equalis, natural size. 



large and in the male adapted for 

 clasping. In ThamnocepJialus (Fig. 

 245, T. bracliyurus Packard, from 

 Kansas) there is a singular shrub- 

 like projection of the front of the 

 head, and the abdomen is spatulate 

 or spoon-shaped at the end. Bran- 

 chinectes Coloradensis Pack. (Fig. 

 246) is a Rocky Mountain form. ?}s- 244.-, Larva of Apus can* 



' . , J T cnformfs. After Zaddach. b, 



The brine - shrimp, Artemia, lives Naupliusof ArtemiasalinaofEu- 



only in brine-vats or in the salt 



lakes of the West and of Southern Europe. Artemia gra~ 



cilis Verrill (Fig. 247) has thus far only been found in tubs 



